/Python/How to create one list from 2d list python

How to create one list from 2d list python

How to create 2d list in python

o=[]
for i in range(0,rows):
    x=[]
    for j in range(0,cols):
        x.append(0)
    o.append(x)
#if you use [[0]*cols]*rows all rows will become the same list
#so editing in one row will edit all rows

How to create one list from 2d list python

>>> l = [[1, 2, 3], [4, 5, 6], [7], [8, 9]]
>>> sum(l, [])
[1, 2, 3, 4, 5, 6, 7, 8, 9]

Python declare 2d list

length, breadth = x, y
matrix = [[-1 for j in range(breadth)] for i in range(length)]
# every element is -1

Similar codes

3 votes288 views2 answers
Python multiply list by scalar
Python
0 vote281 views1 answer
How to make curl request python
Python
1 vote285 views1 answer
Django admin action
Python
3 votes297 views3 answers
Import flask
Python
0 vote280 views3 answers
Discord.py get channel name from id
Python
83 votes286 views2 answers
Download python for windows7 64 bit
Python
1 vote264 views1 answer
Reverse row order pandas
Python
0 vote254 views1 answer
Pandas drop row from a list of value
Python
-1 vote298 views1 answer
Negate an int in python
Python
-2 votes292 views1 answer
Reverse python3
Python